Controlling device for electric motors



(N M 161. 2 SheetsSheet 1.

F. O. BLAGKWELL.

CONTROLLING DEVICE FOR ELECTRIC MOTORS.

No. 452,422. Patented May 19,1891.

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(No Model.) 2 Sheets-Sheet 2.

F. O. BLACKWELL.

CONTROLLING DEVICE FOR ELECTRIC MOTORS. N0. 452,422. Patented May 19,1891.

WITN 55E5 INVENTEIR r noams versus 00., Pnmcmmm, msmucn'ou n c UNITED STATES PATENT OFFICE.

FRANCIS O. BLACKVVELL, OF NElV YORK, N. Y., ASSIGNOR TO THE THOMSON- HOUSTON ELECTRIC COMPANY, OF CONNECTICUT.

CONTROLLING DEVICE FOR ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 452,422, dated May 19, 1891. Application filed July 13, 1889. Serial No. 317,375. (No model.)

To aZZ whom it may concern: by which it may be connected at will to wire 5, Reit known thatl, FRANCIS O. BLAOKWELL, thereby short-circuiting one section of fielda Clf-lZCl'lOfI-DG United States, residing at New magnet coil A. As shown in this figure, the York, 1n the county of New York and State of circuit is as follows: trolley-wire 7 R 3 A 5 D 5 New York, have invented certain new and 1 B 2 (3 E. By turning reverse-switch D the useful Improvements in Controlling Devices direction of current in armature B will be for Electric Motors, of which the following is altered. The same etfect is produced when a becification. the car is operated from the other end, the

My invention relates to controlling devices circuit being broken at R, C, or D at one end T0 for electric-railway motors. It has heretofore when the caris operated at the other end.

been customaryin the regulation of motors of In Fig. 2 the reverse-switch D is shown this type to introduce a variable artificial rewith the cut-out switch F combined with it. sistance to control the motor over a certain G H K are threeinsulated contact-arms movrange and then to give an additional range of able about a common center by means of le- 05 5 speed by cutting out a section of the fieldver L. G and K are constantly in circuit magnet coil. This operation has usually been with contact-pieces M and N, connected, reperformed by a single switch; but as this inspectively, to opposite terminals of armature troduces complications in the electrical con- B. O O and P P are two sets of contactnectionsIhaveprovided both aresistance and pieces, connected the former to one terminal 20 a cut-out switch to be operated independof field-magnet A and the latter to the lineently of the resistance. Ihave also combined terminal. the field-magnet cut-out switch with the re- In operation the contact-arms G and K alversing-switch of the motor, so that an externately connect to contact-pieces M N, retraordinary movement of the reverse switch spectively, O P and O P. Contact-arm H, 25 will act to cut out a part of the field-magnet which is for operating the cut-out, bears norcoils. I have also devised a convenient mally on a contact-piece R. At either eX- method for cutting out fieldonagnet coils tremity of R is a supplementary contactwhen they are in series. piece S, both of which are connected in se- In the accompanying drawings, Figure l is ries to a wire 8, leading from an intermediate 30 a diagram showing the application of my inpoint in one leg of field-magnet A. An independent cut-out to a car operated from termediate point in the opposite leg of the both ends. Fig. 2 is a detail of the combined field-magnet is connected by wire 9 to 0011- reverse and cut out switch. tact-piece R. Vhenever the space between In Fig. 1, A represents the field-magnet of R and either one of the contact-pieces S is 35 the motor; B, the armature; R R, variable bridged by arm H, one section of each leg resistance of any well-known type. C and D of the field-magnet is short-circuited and the are reverse-switches placed at opposite ends power of the magnet thereby weakened. In of the vehicle. As these reverse switches are the position shown lever L has its latch in duplicates ofeach other, a description of one the notch a the current then passing in one 4,0 with its connections applies equally to the direction, as shown by the arrows, through other. Referring to switch D, it will be seen the armature I3 and through the whole of that two of its terminals are connected to field-magnet A. \Vhen L is moved until its Wires 1 and 2, leading from armature B. The latch comes into notch a the current will be other two terminals are connected to Wires reversed through thearmature,but no change 45 '5 and 0, leading, respectively, to field-magwill be effected in the field-magnet. Vhen, not A and to the ground-terminal E. The however, the latch reaches the notch a or a resistance-box R has oneterminal connected the armature is not only correspondingly reto the trolley-Wire 7 and the other to wire 3. versed but part of the field-magnet is short- A wire 4 is extended through the car and circuited. I00 50 connected to a section of the field-magnet. WVhat I claim as new, and desire to secure At opposite ends of wire 4 is hand-switch F, by Letters Patent, is

1. The combination of an electric motor having a sectional Iieldand a variable resistance, by both of which agencies the motor is regulated, and a switch independent of the resistance-controller for cutting out or shortcircuiting a section of the field.

2. The combination, with an electric motor, of a controlling-resistance in circuit therewith, a reversing-switch, and a supplementary contact on the reversing-switch connected to the field-magnet for short-circuiting or cutting out a part thereof.

3. The combination of armature B, fieldmagnet A, a reversingswitch having its terminals connected to the armature to reverse the current therein, and a supplementary contact on said switch connected to fieldmagnet A for cutting out and short-circuitin g a part thereof."

4. The combination, with an electric motor, of a reversing-switch therefor, and a supplementary contact connected therewith and leading to the field-magnet for cutting out or short-circuiting part thereof.

5. The combination, in an electric-railway vehicle, of a traveling motor having a sectional field, a controllirig-resistance, and reversing-switch, with a supplementary switch connected to the reversing-switch for cutting out or short-circuiting a part of the Iield, as described.

6.. The combination, in an electric-railway vehicle, of a propelling-motor, a controllingresistance, and reversing-switch upon each end of the vehicle, having duplicate connections with the field-magnet for cutting out or short-circuiting a part thereof.

'7. The combination, in an electric-railway vehicle, of a propelling-motor and reversingswitches on opposite ends of the vehicle, having duplicate electrical connections with the motor and each provided with a supplementary contact leading to the field-magnet of the motor.

8. The combination of an electric motor having its armature and field-magnet in series, the latter consisting of two coils like- Wise in series with one another, with a cutout switch consisting of contact-pieces connected to like points in both coils, and a contactarm for connecting the said pieces and thereby cutting out like portions of each coil.

FRANCIS O. BLACKXVELL.

Witnesses:

EDWARD M. BENTLEY, G. RENAULT. 

